Reviews The Fifth Postulate: How Unraveling a Two-Thousand-Year-Old Mystery Unraveled the Universe by Jason Socrates Bardi Share this: Share via email (Opens in new window) Email Click to share on Facebook (Opens in new window) Facebook Click to share on Reddit (Opens in new window) Reddit Click to share on X (Opens in new window) X Click to print (Opens in new window) Print By Science News April 23, 2009 at 4:05 pm The story of the discovery of non-Euclidean geometry.Wiley, 2009, 253 p., $27.95. THE FIFTH POSTULATE: HOW UNRAVELING A TWO-THOUSAND-YEAR-OLD MYSTERY UNRAVELED THE UNIVERSE BY JASON SOCRATES BARDI